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As soon as you start giving them anything other than their Starter, they need grit to help digest it. Their baby food is specially made of highly digestible stuff, so they don't need the grit for that. But for everything else, they do. You can mix a bit of grit with their regular food, sprinkle on their treats, etc. I wouldn't give them a separate bowl of grit though, they can fill up on that instead of food (well, they are babies!). We only give our chicks grit with their treats (sprinkle on yogurt or a mash we make with hardboiled egg & their starter + sugar water & vitamins). Seems to work fine.
ETA: don't use oyster shell. If you don't have a feed store accessible, buy grit made for parakeets or canaries or something like that, but check to see that it's not Oyster shell. If you can't find that, buy sterilized fine sand (can sometimes find it by lizard supplies).